Global Patent Index - EP 1054238 A2

EP 1054238 A2 2000-11-22 - Method and apparatus for detecting position using phase-shifted signals

Title (en)

Method and apparatus for detecting position using phase-shifted signals

Title (de)

Verfahren und Gerät zur Messung der Position unter Verwendung von phasenverschobenen Signalen

Title (fr)

Procédé et appareil de détection de données positionelles utilisant de signaux décalés

Publication

EP 1054238 A2 (EN)

Application

EP 00110444 A

Priority

JP 13924299 A

Abstract (en)

First A.C. output signals (sin( omega t+)) having an electric phase angle shifted in a positive direction in accordance with a position-to-be-detected is produced along with a second A.C. output signal (sin( omega t-)) having an electric phase angle shifted in a negative direction. First and second detection data are generated by detecting respective phase differences (+ and -) of the first and second A.C. output signals from a predetermined reference phase. First predicted value is provided on the basis of at least two successive samples of the first detection data, and a second predicted value is provided on the basis of at least two successive samples of the second detection data. The first and second predicted values are modified to provide a standard predicted value for correcting a nonlinear error resulting from the Doppler effect. Using this standard predicted value, predictive interpolation is performed on the first and second detection data sequentially with the passage of time, so as to provide first and second interpolated detection data. With this arrangement, it is possible to achieve improved response and detection performance with respect to dynamic characteristics. <IMAGE>

IPC 1-7 (main, further and additional classification)

G01D 5/243

IPC 8 full level (invention and additional information)

G01B 7/00 (2006.01); G01D 5/20 (2006.01); G01D 5/243 (2006.01); G01D 5/245 (2006.01)

CPC (invention and additional information)

G01D 5/204 (2013.01)

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 1054238 A2 20001122; EP 1054238 A3 20020327; JP 2000329505 A 20001130; JP 4355395 B2 20091028; US 2003033103 A1 20030213; US 6484120 B1 20021119; US 6571194 B2 20030527

INPADOC legal status


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